Description

PT. Cahaya Kalimas Utama Authorized Distributor of Victaulic

Function
• Mechanical, water-powered device to signal the flow of water in an automatic sprinkler system
• Typically installed on a wall with the motor inside the building and the gong outside for maximum audibility
Application
• The standard water motor alarm assembly accommodates wall thicknesses from 2 – 13″/51 – 330 mm. Wall
thicknesses that fall outside this range must be specified at the time of order. A riser mounting kit is available that
will fit 2½” – 8″/DN200 pipe sizes in vertical or horizontal position.
• The total length of alarm line piping must not exceed 75 ft/23 m.
• The water motor alarm assembly must not be located more than 20 ft/6 m above the sprinkler control valve.
• Alarm line piping from a retard chamber to the water motor alarm must be galvanized and 3/4″/20 mm minimum
in diameter. If pressure is low, or if longer runs of piping are necessary, larger diameter galvanized piping must be
used.
• A maximum of three sprinkler system control valves can be connected to one water motor alarm. The sprinkler
system control valves must be located in the same hazard area.
• A check valve must be installed in the piping from each sprinkler system control valve to ensure proper operation
of the water motor alarm.
• A 50-mesh strainer with 3/4″/20 mm NPT threaded-end connection is provided for compliance with NFPA 13
requirements. This strainer must be installed in the alarm line at the alarm motor housing’s inlet.
• Drain piping must be 1″/33.7 mm in diameter.
• Piping must be pitched so that water will drain back to the sprinkler system control valve and through a corrosionresistant orifice no larger than 1/8″/3 mm.
• Drains must be piped to a heated space where no personal injury, property damage, or freezing will occur when
the alarm is operating.